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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Release of Oxygen Atoms and Nitric Oxide Molecules from the Ultraviolet Photodissociation of Nitrate Adsorbed on Water Ice Films at 100 K
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Release of Oxygen Atoms and Nitric Oxide Molecules from the Ultraviolet Photodissociation of Nitrate Adsorbed on Water Ice Films at 100 K

机译:100 K下水冰膜上硝酸盐的紫外光解离释放氧原子和一氧化氮分子

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摘要

Production of O(~3P_J, J =2, 1,0) atoms from the 295-320 nm photodissociation of NO_3~- adsorbed on water poly crystalline ice films at 100 K was directly confirmed using the resonance-enhanced multiphoton ionization technique. Detection of the O atom signals required an induction period after deposition of HNO3 onto the ice film held at 130 K due to the slow ionization rate of HNO3 to H~+ and NO_3~- with a rate constant of k = (5.3 ± 0.2) X 10~(-3) s~(-1). Translational energy distributions of the O atoms were represented by a combination of two Maxwell-Boltzmann energy distributions with translational temperatures of 2000 and 100 K. Direct detection of NO from the secondary photodissociation process was also successful. On the atmospheric implications, the influence of the direct release of the oxygen atoms into the air from NO_3~- adsorbed on the natural snowpack was included in an atmospheric model calculation on the mixing ratios of ozone and nitric oxide at the South Pole, and the results compared favorably with the field data.
机译:使用共振增强多光子电离技术直接证实了在100 K下吸附在水多晶冰膜上的NO_3〜-的295-320 nm光解离产生了O(〜3P_J,J = 2,1,0)原子。 O信号的检测需要HNO3沉积到保持在130 K的冰膜上之后的诱导期,这是因为HNO3缓慢地电离为H〜+和NO_3〜-的速率,其常数为k =(5.3±0.2) X 10〜(-3)s〜(-1)。 O原子的平移能量分布由两个Maxwell-Boltzmann能量分布与平移温度分别为2000和100 K的组合表示。从二次光解离过程直接检测NO也很成功。在大气影响方面,在对南极臭氧和一氧化氮的混合比进行大气模型计算时,将氧原子从吸附在天然积雪堆上的NO_3〜-直接释放到空气中的影响包括在内。结果优于现场数据。

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